Rolling mill



1'. HUMAN. ROLLING'MILL.

APPLICATION FILED JUNE 2, 1920.

Patented Aug. 1; 1922.

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[mm/r J. REIMANN.

ROLLIN-fi MILL. APPLICATION FILED JUNE 2, 1920.

1 ,424,67. Patented Aug. 1, 1922.

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m 1. REIMANN.

ROLLING MI LL.

' APPLICATION FILED JUNE 2,1920.

Patented Aug. 11, 1922.

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B M H M N LAN ROLLING MILL.

Specification of Letters Patent. Pate t d A 1 1922 Application filed June 2, 1920. "seria no. 3561087.

(GRANTED UNDER rnnrao'visrotrs OF'THE Aeror Mason 3, 1921, 41"srA'r. L, 1313.

To all whom it may concern:

Be it known that I JAo Uns 'BmwmNN, engineer, residing at 'Erdlngton, Birmingham, England, have invented certain new and useful Improvements in Rolling Mills (for which I have filed application'in Eng land Feb. 11, 1919, Patent No. 135,707), of

which the following is a specification.

This invention relates torollin'g mills and has for 'its object to provide improvements "each'of different pitch and engaged by a cooperating nut, and means'are provided for operating selectively either one of the nuts to actuate the feed spiral. Thus two sets only of threads may be employed, one set of normal pitch, and the other of a shorter pitch for use when startingthe work in the rolls. By employing more than two sets of threads the same feed-spiral may be employed for rolls of diiferent diameter which involve a greater or a lesser travel of the work, thus economizing in time in setting up the machine and reducing first cost of the parts thereof.

To economize space in the machine the different threads may be out upon the same portion of the feed-spiral and may consequently intersect one another, and have the same, or opposite angles of inclination. This allows the several nuts to be mounted closely adjacent to one another and thus reduces the length of the housing required to carry them. i

The pawls may be in the form of plungers radially disposed around the ratchet teeth on the nuts, and Cam may be provided on members rotatable, manually or otherwise, around the nuts to lift the plungers against the action of springs, the mechanism being "the drawings.

C for the second spiral.

-"so arrangedthat one nut only at a tim an 'be engaged by the'pawls, a neutral position beingprovided in which all the pawls are disengaged from the nuts.

The manner of'carrying'outthe invention is illu strated in the accompanying drawings,

in which Figure 1 is a central longitudinal section "through the feedspiral "mechanism taken in the plane of its'a'xis,'and

ldlgure 2 is a transverse s'ection of which the left hand part is taken on the line 2, 2

Like letters indicate like parts throughout The feed spiral'comprises the usual multiple-threaded member A, with thethreads A butin addition to these has formed upon it afseoond feed-spiral with threads A which intersect those of the first one and are of ashorter pitch. The usual housing B for thenut C'which engages the first feedspiral is lengthened to receive also the nut Each nut has on its periphery the usual ratchet teeth C and the. pawls for each are in the form of radially disposed plungers D, pressed inwardly to the ratchet teeth by means of the springs D Three such pawls may be employed for each nut and each pawl has formed in its side a notch D A. segment E of a ring mounted concentrically with the axis of the feed-spiral to move angularly about it, lies against the plungers D and carries on the face adjacent to them a parti-annular projection E which traverses their notches D clearance being provided in the latter for the radial movement of the plungers as they ride over the ratchet teeth. Notches E are formed in the projection E and upon their bottom surfaces E rest the outer sides of the notches D in the plungers D, when the latter are at their inner position radially.

"One side E of each notch E in the projecof each nut C, C and are carried upon or integral with segments of bevel wheels E spaced opposite one another between the two nuts. A bevel pinion F mounted upon a spindle F rotatably supported in a cover B for the housing B, gears with the bevel wheel segments E and can be rotated by means of a hand lever F In operation, when the bevel pinion F is rotated, the ring segments E are moved in directions opposite one another around the feed spiral', the cam faces E at the sides of s the notches in the projections E? being so arranged that in one extreme of movement one set of pawls is 'in. engagement with the ratchet teethC of onenut, and at the other extreme the other set of pawls is engaged withthe teeth of the other nut, an interme diate position being provided in which both sets are disengaged, so that both nuts cannot be in operation at once.

At starting the operator puts into action *thefp'awls which engage'the shorter pitch "spiral, and, when, during the operation of rolling, the full travel is obtained, the

longer pitch spiral is brought into engagement and the operations are then continued infthe usual manner. Ifdesired the change from onefeed to the other could be effected by connecting the above described mechanism with a moving part of the rolling milL By making the feed-spiral of sufficient diameter several sets of threads of different pitches can be formed thereon thus econo- -rnizing maintenance cost by'reducing the number of separate feed-spirals stocked to suit the various diameters of rolls. Time occupied in changing spirals would thereby be reduced considerably Where more than two sets of spirals having different pitches are cut on the same feed member it might be desirable that some should be of opposite inclination to, the others to avoid liability of fouling at the groove-junctions in the nuts, but this forms no part of the present invention.

invention and deslre What'l claim as mg to secure by Letters atent of the United States is 1. In a'rolling mill, a plurality of feedspirals each of a different pitch and operatively connected to the work-carrier and travelling with it to cause its partial rotation, eac'hfeed spiral adapted to cause a twist of substantially 90, the longest pitch effecting this during the full return of the carrier, and the shorter pitches effecting it in lesser travels of the carrier, each feed.

: spiral engaged by a co-operating nut immovvableendwise, and means operable selectively for holding any one nut against rotation during the retractlon of the work-carrier and vvorlg substantially as set forth.

: 2. In a rollingmill, two feed spirals coaxially mounted with the work-carrier and travelling with it, each feed-spiral constituted by a quick-pitch threaded member, the pitch of one adapted to cause substantially .90 of twist of the carrier and work during its normal full travel, the pitch of the other adapted to cause a similar degree of twist with a shorter travel of the work, a co-operating nut, immovable endwise, for each of said feed-spirals, a pawl for each nut engaging ratchet teeth thereon,and arranged to permit rotation of either nut during the forward stroke of the carrier and to hold either stationary on" the return movement thereof,

and means for engaging selectively either I pawl with its associated nut, substantially as set forth.

3. In a rolling mill, a feed-spiral member coaxially mounted. with the work-carrier, and travelling with it, two. sets of threads upon said feed-spiral member, one set adapted to cause an angular twist of the carrier through substantially 90, during the full travel of said carrier, the other adapted to cause a similar twist during a shorter travel of the carrier, each set of threads engaged by a co-operatii'ig nut, said nuts being situated adjacent one another and immovable endwise, the threads engaged by one nut extending over the part of the feed-spiral member carrying the threads engaged by the other nut, pawls engaging ratchet teeth formed on the periphery of said nuts and arranged so that the nuts can rotate freely during the forward movement of the carrier, and either nut at will can be held against rotation during the return movement of the carrier, cams engaging the pawls upon each nut, and gearing actuating said cams whereby at will one nut" only at a time can be operatively engaged by its pawls, substantially as set forth.

4-. In a rollingmill as claimed in claim 3, the employment of radially disposed pawls, spring pressed into engagement with the ratchet teeth on each co-operating nut for the several threads on the feed-spiral memher, two sets of cams, each set carried upon members rotatablearound the axis. of the feed-spiral, one set of cams engaging the pawls of one cooperating nut, the other set engaging those of the other nut, and a bevel pinion rotatable at Will, engaging corresponding bevel teeth on each cam-carrying 

